PostgreSQL [Deployment 02] Install PostgreSQL online (Some psql features might not work problem handling + role password setting + configure remote access)

Install PostgreSQL online

1.Installation

Official installation document PostgreSQL: Linux downloads (Red Hat family) Choose according to your needs:

PostgreSQL的 version
Deployment environment platform
Select the server architecture

Copy, paste and run the relevant parts of the setup script

Insert image description here
Example:

# Install the repository RPM:
sudo yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

# Install PostgreSQL:
sudo yum install -y postgresql12-server

# Optionally initialize the database and enable automatic start:
sudo /usr/pgsql-12/bin/postgresql-12-setup initdb
sudo systemctl enable postgresql-12
sudo systemctl start postgresql-12

2.Use

2.1 Some psql features might not work problem handling

sudo -u postgres psql

[root@tcloud ~]#  sudo -u postgres psql
psql (9.2.24, server 12.15)
WARNING: psql version 9.2, server version 12.0.
         Some psql features might not work.

# 替换旧文件        
mv /usr/bin/psql /usr/bin/psql.bak
ln -s /usr/pgsql-12/bin/psql /usr/bin/psql

[root@tcloud ~]# psql -version
psql (12.15)
Type "help" for help.

2.2 Role and password settings

# 创建角色
CREATE ROLE admin;
# 设置密码并赋权
ALTER ROLE admin WITH SUPERUSER INHERIT CREATEROLE CREATEDB LOGIN PASSWORD 'admin'; 

# 默认用户设置密码
ALTER USER postgres WITH PASSWORD 'postgres';

# 查询用户
SELECT * FROM pg_user;
postgres=# SELECT * FROM pg_user;
 usename  | usesysid | usecreatedb | usesuper | userepl | usebypassrls |  passwd  | valuntil | useconfig
----------+----------+-------------+----------+---------+--------------+----------+----------+-----------
 admin    |    16384 | t           | t        | f       | f            | ******** |          |
 postgres |       10 | t           | t        | t       | t            | ******** |          |
(2 rows)

2.3 Configure remote access

# 设置监听地址
vim /var/lib/pgsql/12/data/postgresql.conf 
listen_addresses='*'
port=5432

# 添加到配置文件 /var/lib/pgsql/12/data/pg_hba.conf
echo  "local all admin trust" >> /var/lib/pgsql/12/data/pg_hba.conf
echo  "host all admin 0.0.0.0/0 md5" >> /var/lib/pgsql/12/data/pg_hba.conf

echo  "local all postgres trust" >> /var/lib/pgsql/12/data/pg_hba.conf
echo  "host all postgres 0.0.0.0/0 md5" >> /var/lib/pgsql/12/data/pg_hba.conf

# 重启
sudo systemctl restart postgresql-12